[13/13] generic: add mmap CoW test for mixed&source extents

Commit Message

Shiyang Ruan Nov. 11, 2021, 8:51 a.m. UTC

Ensuring that copy on write in buffered mode works when the CoW
range originally covers multiple extents, mixed with reflinked, unwritten,
hole, regular and delalloc blocks.

Signed-off-by: Shiyang Ruan <[e-mail]>
---
 tests/generic/921     | 67 +++++++++++++++++++++++++++++++++++++++++++
 tests/generic/921.out | 12 ++++++++
 2 files changed, 79 insertions(+)
 create mode 100755 tests/generic/921
 create mode 100644 tests/generic/921.out

Patch

diff --git a/tests/generic/921 b/tests/generic/921
new file mode 100755
index 00000000..7c463143
--- /dev/null
+++ b/tests/generic/921
@@ -0,0 +1,67 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# FS QA Test No. xxx
+#
+# Ensuring that copy on write in mmap mode works when the CoW
+# range originally covers multiple extents, mixed with reflinked, unwritten,
+# hole, regular and delalloc blocks.
+#   - Create a file with the following repeating sequence of blocks:
+#     1. reflinked
+#     2. unwritten
+#     3. hole
+#     4. regular block
+#     5. delalloc
+#   - mmap CoW across the halfway mark, starting with the unwritten extent.
+#   - Check that the files are now different where we say they're different.
+#
+. ./common/preamble
+_begin_fstest auto quick clone punch
+
+# Import common functions.
+. ./common/filter
+. ./common/reflink
+
+# real QA test starts here
+_require_scratch_reflink
+_require_xfs_io_command "falloc"
+_require_xfs_io_command "fpunch"
+_require_cp_reflink
+_require_odirect
+
+echo "Format and mount"
+_scratch_mkfs > $seqres.full 2>&1
+_scratch_mount >> $seqres.full 2>&1
+
+testdir=$SCRATCH_MNT/test-$seq
+mkdir $testdir
+
+echo "Create the original files"
+blksz=65536
+nr=64
+filesize=$((blksz * nr))
+_sweave_reflink_rainbow $blksz $nr $testdir/file1 $testdir/file3 >> $seqres.full
+_scratch_cycle_mount
+
+echo "Compare files"
+md5sum $testdir/file1 | _filter_scratch
+md5sum $testdir/file3 | _filter_scratch
+md5sum $testdir/file1.chk | _filter_scratch
+
+echo "mmap CoW across the transition"
+cowoff=$((filesize / 4))
+cowsz=$((filesize / 2))
+_sweave_reflink_rainbow_delalloc $blksz $nr $testdir/file1 >> $seqres.full
+# now cow
+mmapsz=$((cowoff + cowsz))
+_mwrite_byte 0x63 $cowoff $cowsz $mmapsz $testdir/file1 >> $seqres.full
+_mwrite_byte 0x63 $cowoff $cowsz $mmapsz $testdir/file1.chk >> $seqres.full
+_scratch_cycle_mount
+
+echo "Compare files"
+md5sum $testdir/file1 | _filter_scratch
+md5sum $testdir/file3 | _filter_scratch
+md5sum $testdir/file1.chk | _filter_scratch
+
+# success, all done
+status=0
diff --git a/tests/generic/921.out b/tests/generic/921.out
new file mode 100644
index 00000000..3405a4df
--- /dev/null
+++ b/tests/generic/921.out
@@ -0,0 +1,12 @@ 
+QA output created by 921
+Format and mount
+Create the original files
+Compare files
+6366fd359371414186688a0ef6988893  SCRATCH_MNT/test-921/file1
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-921/file3
+6366fd359371414186688a0ef6988893  SCRATCH_MNT/test-921/file1.chk
+mmap CoW across the transition
+Compare files
+26aa3a0749b867ec58363c8539ee5471  SCRATCH_MNT/test-921/file1
+bdbcf02ee0aa977795a79d25fcfdccb1  SCRATCH_MNT/test-921/file3
+26aa3a0749b867ec58363c8539ee5471  SCRATCH_MNT/test-921/file1.chk